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36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
From 15c7c4d39b317f0d902ef28fd43eca5c3369f891 Mon Sep 17 00:00:00 2001
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From: Max Filippov <jcmvbkbc@gmail.com>
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Date: Sat, 15 Aug 2015 05:12:11 +0300
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Subject: [PATCH 3/3] xtensa: fix _Unwind_GetCFA
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Returning context->cfa in _Unwind_GetCFA makes CFA point one stack frame
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higher than what was actually used by code at context->ra. This results
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in invalid CFA value in signal frames and premature unwinding completion
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in forced unwinding used by uClibc NPTL thread cancellation.
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Returning context->sp from _Unwind_GetCFA makes all CFA values valid and
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matching code that used them.
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2015-08-18 Max Filippov <jcmvbkbc@gmail.com>
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libgcc/
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* config/xtensa/unwind-dw2-xtensa.c (_Unwind_GetCFA): Return
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context->sp instead of context->cfa.
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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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---
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Backported from: r226964
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libgcc/config/xtensa/unwind-dw2-xtensa.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/libgcc/config/xtensa/unwind-dw2-xtensa.c
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+++ b/libgcc/config/xtensa/unwind-dw2-xtensa.c
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@@ -130,7 +130,7 @@
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_Unwind_Word
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_Unwind_GetCFA (struct _Unwind_Context *context)
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{
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- return (_Unwind_Ptr) context->cfa;
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+ return (_Unwind_Ptr) context->sp;
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}
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/* Overwrite the saved value for register INDEX in CONTEXT with VAL. */
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